Finding the Third Proportional to 30,121.88 and 65,429.25

Step by Step Solution

1. Step 1: Write the proportion equation
   30,121.88 : 65,429.25 = 65,429.25 : x
2. Step 2: Convert to fraction form
   30,121.88/65,429.25 = 65,429.25/x
3. Step 3: Cross multiply
   30,121.88x = 65,429.25 × 65,429.25
4. Step 4: Simplify right side
   30,121.88x = 4,280,986,755.56
5. Step 5: Solve for x
   x = 4,280,986,755.56/30,121.88
6. Step 6: Final answer
   x = 142,122.19